On Apr 2, 2012, Clary from Lewisburg, PA (Zone 6b) wrote:
I planted this in a rock garden but later removed it; however I have now found it in my lawn and elsewhere near to the original planting. It's very difficult to remove among other plants. It creeps low to the ground and isn't visible under the leaves of taller plants unless you look carefully, and the plant is so tender that it doesn't "rip out" and needs careful digging to remove it. It is extremely vigorous and grows quickly from any piece of plant that is left behind. I found the flowers to be nearly insignificant but the leaves and stems have an interesting texture.